Chemical Engineering April 2020 - 28

Cover Story
Part 1
Principles of
Agglomeration:
Pelletizing Processes
Pelletizing, a tumble-growth agglomeration process, offers many potential benefits to
processors handling bulk solid materials. This article provides an overview of how agglomerate
pelletizing works and the important elements that must be considered
Chris Kozicki,
Ron Eichhorn
and Carrie
Carlson
FEECO International
IN BRIEF
PROCESSING BENEFITS
PELLETIZING PROCESS
PRIMARY STEPS
PELLETIZING PROCESS
ADD-ONS
PELLETIZIING
CONSIDERATIONS:
BINDER, MOISTURE AND
PRECONDITIONING
P
elletizing, a form of agglomeration
(particle size
enlargement) employed to
produce a rounded granule,
is a valuable operation when working
with bulk solids. The technique
offers a number of possible improvements
to the handling, appearance,
application and performance of a
wide range of solids materials. The
term " pelletizing " is often used interchangeably
to refer to various types
of agglomeration. This article refers
only to pelletizing in terms of tumblegrowth
agglomeration, which is carried
out using a disc pelletizer.
As a form of tumble-growth agglomeration,
the pelletizing process
is highly customizable and can be
used to produce a spherical granular
product to exacting specifications.
The pelletizing process is most often
carried out on a disc pelletizer, typically
preceded by a preconditioning
step in a pin mixer, and followed by
a drying step, with additional process
steps possible.
This article looks at the process of
agglomerate pelletizing, including the
potential benefits that can be realized
through pelletizing, how the process
works and the key principles behind
a successful pelletizing operation.
FIGURE 1. Powders, such as the raw limestone shown here (left), can present
difficulties in transportation and application. The pelletized form of limestone
(right) can alleviate these difficulties
FIGURE 2. Synthetic gypsum is an example of a commonly pelletized solid
material
PROCESSING AND MATERIAL
BENEFITS
Pelletizing can be used to impart a number
of improvements to both raw materials and
28
end products. While not all products will
exhibit all benefits, pelletizing can generally
offer the following advantages:
Dust reduction or mitigation. When workCHEMICAL
ENGINEERING WWW.CHEMENGONLINE.COM
APRIL 2020

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Chemical Engineering April 2020

Table of Contents for the Digital Edition of Chemical Engineering April 2020

Contents
Chemical Engineering April 2020 - Cover1
Chemical Engineering April 2020 - Cover2
Chemical Engineering April 2020 - Contents
Chemical Engineering April 2020 - 2
Chemical Engineering April 2020 - 3
Chemical Engineering April 2020 - 4
Chemical Engineering April 2020 - 5
Chemical Engineering April 2020 - 6
Chemical Engineering April 2020 - 7
Chemical Engineering April 2020 - 8
Chemical Engineering April 2020 - 9
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Chemical Engineering April 2020 - Cover3
Chemical Engineering April 2020 - Cover4
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